Camera lens

Abstract

The application relates to the field of optical lenses and discloses a camera optical lens which comprises four lenses and is sequentially arranged from an object side to an image side as follows: a first lens with negative refractive power, a second lens with positive refractive power, a third lens with positive refractive power, and a fourth lens with positive or negative refractive power; wherein the focal length of the camera optical lens is f, the entrance pupil diameter of the camera optical lens is ENPD, the focal length of the third lens is f3, the on-axis thickness of the third lens is d5, the central curvature radius of the object side of the first lens is R1, the central curvature radius of the image side of the first lens is R2, the focal length of the first lens is f1, and the following relationships are met: 0.90 <= f / ENPD <= 1.20; 2.00 <= f3 / d5 <= 9.00; 0.20 <= (R1+R2) / f1 <= 0.70.

Description

Technical Field

[0001] This invention relates to the field of optical lenses, and in particular to a laser radar receiving lens suitable for vehicle use. Background Technology

[0002] With the rapid development of intelligent connected vehicles and autonomous driving technologies, Advanced Driver Assistance Systems (ADAS) are placing extremely high demands on the three-dimensional perception capabilities of the vehicle's surrounding environment. LiDAR, with its advantages of long detection range, high resolution, and strong anti-interference capabilities, has become an indispensable core sensor for in-vehicle environmental perception systems.

[0003] In a lidar system, the receiving lens is a key optical component that determines the detection performance of the entire system. Its main function is to collect the weak laser signal reflected back by the target object and accurately focus it onto the photosensitive surface of a photodetector (such as an APD, SPAD, or SiPM).

[0004] Currently, the wavelength of light sources for automotive LiDAR is gradually evolving towards the 920nm~960nm band (especially around 940nm). Compared to the traditional 905nm band, the 940nm band is located in the strong absorption band of water molecules in the atmosphere. Sunlight at the 940nm band is largely absorbed when penetrating the atmosphere, resulting in extremely low solar background noise. Using LiDAR operating in the 920nm~960nm band can significantly reduce interference from ambient stray light on the detector, effectively improving the system's signal-to-noise ratio. There is an urgent need in existing technology for a LiDAR receiving lens that can perfectly adapt to the 920nm~960nm band, while possessing ultra-high light transmittance, excellent optical resolution, and meeting the requirements of wide temperature range environments and miniaturization in automotive applications. Summary of the Invention

[0005] To address the aforementioned problems, the main objective of this invention is to provide a camera optical lens that possesses excellent optical performance while meeting the design requirements for high light throughput.

[0006] To achieve the above objectives, the present invention provides a camera optical lens comprising four lenses, which are arranged sequentially from the object side to the image side as follows: a first lens with negative refractive power, a second lens with positive refractive power, a third lens with positive refractive power, and a fourth lens with either positive or negative refractive power; wherein the focal length of the camera optical lens is f, the entrance pupil diameter of the camera optical lens is ENPD, the focal length of the third lens is f3, the axial thickness of the third lens is d5, the central radius of curvature of the object side of the first lens is R1, the central radius of curvature of the image side of the first lens is R2, and the focal length of the first lens is f1, satisfying the following relationships: 0.90≤f / ENPD≤1.20; 2.00≤f3 / d5≤9.00; 0.20≤(R1+R2) / f1≤0.70.

[0007] Preferably, the axial distance from the image side of the second lens to the object side of the third lens is d4, the axial thickness of the second lens is d3, and the following relationship is satisfied: 1.30≤d4 / d3≤2.50.

[0008] Preferably, the central radius of curvature of the object side of the fourth lens is R7, and the central radius of curvature of the image side of the fourth lens is R8, and the following relationship is satisfied: 0.30≤R7 / R8≤1.20.

[0009] Preferably, the object-side surface of the first lens is concave near the axis, and the image-side surface of the first lens is convex near the axis; the axial thickness of the first lens is d1, and the total optical length of the imaging optical lens is TTL, and satisfies the following relationships: -4.27≤f1 / f≤-1.15; -6.40≤(R1+R2) / (R1-R2)≤-3.27; 0.039≤d1 / TTL≤0.072.

[0010] Preferably, the object-side surface of the second lens is convex at the paraxial position, and the image-side surface of the second lens is concave at the paraxial position; the focal length of the second lens is f2, the central radius of curvature of the object-side surface of the second lens is R3, the central radius of curvature of the image-side surface of the second lens is R4, the axial thickness of the second lens is d3, and the total optical length of the camera lens is TTL, and satisfies the following relationships: 1.22≤f2 / f≤3.05; -4.11≤(R3+R4) / (R3-R4)≤-2.77; 0.085≤d3 / TTL≤0.128.

[0011] Preferably, the object-side surface of the third lens is concave near the axis, and the image-side surface of the third lens is convex near the axis; the central radius of curvature of the object-side surface of the third lens is R5, the central radius of curvature of the image-side surface of the third lens is R6, and the total optical length of the camera lens is TTL, and satisfies the following relationships: 1.13≤f3 / f≤2.94; 1.27≤(R5+R6) / (R5-R6)≤8.53; 0.115≤d5 / TTL≤0.234.

[0012] Preferably, the object-side surface of the fourth lens is convex at the paraxial position, and the image-side surface of the fourth lens is concave at the paraxial position; the focal length of the fourth lens is f4, the central radius of curvature of the object-side surface of the fourth lens is R7, the central radius of curvature of the image-side surface of the fourth lens is R8, the axial thickness of the fourth lens is d7, and the total optical length of the camera lens is TTL, and satisfies the following relationships: -77.72≤f4 / f≤2.85; -5.17≤(R7+R8) / (R7-R8)≤11.21; 0.186≤d7 / TTL≤0.221.

[0013] Preferably, the third and fourth lenses are made of glass.

[0014] Preferably, the field of view (FOV) of the camera optical lens in the diagonal direction is 60.00°≤FOV≤68.54°.

[0015] Preferably, the aperture value of the camera optical lens is FNO, and satisfies the following relationship: 0.45≤FNO≤1.21.

[0016] The beneficial effects of the present invention are as follows: The camera optical lens according to the present invention has excellent optical characteristics and high light transmittance. It is a laser radar receiving lens that can work in the 920NM~960NM band, and is especially suitable for mobile phone camera lens assemblies and WEB camera lenses composed of high-pixel CCD, CMOS and other camera elements. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a schematic diagram of the structure of the camera optical lens according to the first embodiment of the present invention; Figure 2 yes Figure 1A schematic diagram of axial aberrations of the camera optical lens shown. Figure 3 yes Figure 1 A schematic diagram of chromatic aberration at magnification for a camera lens; Figure 4 yes Figure 1 A schematic diagram of field curvature and distortion of the camera optical lens shown; Figure 5 This is a schematic diagram of the structure of the camera optical lens according to the second embodiment of the present invention; Figure 6 yes Figure 5 A schematic diagram of axial aberrations of the camera optical lens shown. Figure 7 yes Figure 5 A schematic diagram of chromatic aberration at magnification for a camera lens; Figure 8 yes Figure 5 A schematic diagram of field curvature and distortion of the camera optical lens shown; Figure 9 This is a schematic diagram of the structure of the camera optical lens according to the third embodiment of the present invention; Figure 10 yes Figure 9 A schematic diagram of axial aberrations of the camera optical lens shown. Figure 11 yes Figure 9 A schematic diagram of chromatic aberration at magnification for a camera lens; Figure 12 yes Figure 9 A schematic diagram of field curvature and distortion of the camera optical lens shown; Figure 13 This is a schematic diagram of the structure of the camera optical lens according to the fourth embodiment of the present invention; Figure 14 yes Figure 13 A schematic diagram of axial aberrations of the camera optical lens shown. Figure 15 yes Figure 13 A schematic diagram of chromatic aberration at magnification for a camera lens; Figure 16 yes Figure 13 The diagram shows the field curvature and distortion of the camera lens. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the various embodiments of this invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this invention to facilitate a better understanding of the invention. However, the technical solutions claimed in this invention can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0019] Referring to the accompanying drawings, the technical solution of the present invention provides a camera optical lens 10, 20, 30, 40. Figure 1 , 5 Figures 9 and 13 show the imaging optical lenses 10, 20, 30, and 40 of the present invention, which together comprise four lenses. Specifically, the imaging optical lenses, from the object side to the image side, are as follows: first lens L1, aperture S1, second lens L2, third lens L3, and fourth lens L4. An optical filter GF or other optical element may be disposed between the fourth lens L4 and the image plane Si.

[0020] The first lens L1 is made of plastic, the second lens L2 is made of plastic, the third lens L3 is made of glass, and the fourth lens L4 is made of glass. The first lens L1 and the second lens L2 can also be made of other materials.

[0021] The focal length of a camera optical lens is defined as f, and the entrance pupil diameter of the camera optical lens is defined as ENPD. The following relationship is satisfied: 0.90≤f / ENPD≤1.20. This specifies the range of the ratio between the focal length and the entrance pupil diameter. Within the range of the condition, it helps to increase the amount of light transmitted and improve the signal reception strength.

[0022] The focal length of the third lens L3 is defined as f3, and the on-axis thickness of the third lens L3 is defined as d5, satisfying the following relationship: 2.00≤f3 / d5≤9.00. This specifies the range of the ratio between the focal length and the on-axis thickness of the third lens L3. Within this range, it helps to buffer the change in the incident angle of light with a large angle of view, allowing it to propagate smoothly in the optical imaging lens group, while maintaining the refractive power of the third lens L3 to improve chromatic aberration and enhance image quality.

[0023] The central radius of curvature of the object side of the first lens L1 is defined as R1, the central radius of curvature of the image side of the first lens L1 is defined as R2, and the focal length of the first lens L1 is defined as f1. The following relationship is satisfied: 0.20≤(R1+R2) / f1≤0.70. This specifies the range of the ratio between the sum of the central radii of curvature of the object side and the image side of the first lens L1 and its focal length. Within the range of the condition, the surface shape of the first lens L1 can be reasonably controlled, which helps to reduce the system sensitivity and also reduces stray light generated by the lens, thereby improving the lens imaging quality.

[0024] The axial distance from the image side of the second lens L2 to the object side of the third lens L3 is defined as d4, and the axial thickness of the second lens L2 is d3, satisfying the following relationship: 1.30≤d4 / d3≤2.50. This specifies the range of the ratio between the air gap between the second lens L2 and the third lens L3 and the center thickness of the second lens L2. Within this range, it helps to compress the overall length of the optical system.

[0025] The central radius of curvature of the object side of the fourth lens L4 is defined as R7, and the central radius of curvature of the image side of the fourth lens L4 is defined as R8, satisfying the following relationship: 0.30≤R7 / R8≤1.20. This specifies the range of the ratio of the central radii of curvature of the object side and the image side of the fourth lens L4. Within the range of the condition, by reasonably controlling the surface shape of the fourth lens L4, the field curvature of the system can be effectively balanced, so that the field curvature offset of the central field of view is less than 0.02mm.

[0026] Under the above conditions, the camera optical lenses 10, 20, 30, and 40 have good optical performance and high light transmission, and are laser radar receiving lenses that can operate in the 920NM~960NM band. Based on the characteristics of the camera optical lenses 10, 20, 30, and 40, they are particularly suitable for mobile phone camera lens assemblies and web camera lenses composed of high-pixel CCD, CMOS and other imaging elements.

[0027] Based on the above conditional expressions and the functions that can be achieved, the characteristics of each lens are further refined as follows.

[0028] The object-side surface of the first lens L1 is concave near the axis, and the image-side surface is convex near the axis. The first lens L1 has negative refractive power. The object-side surface and image-side surface of the first lens L1 can also be configured with other concave and convex distributions.

[0029] The focal length of the camera optical lens is defined as f, and the focal length of the first lens L1 is f1, satisfying the following relationship: -4.27≤f1 / f≤-1.15. By controlling the optical power of the first lens L1 within a reasonable range, it is beneficial to correct the aberrations of the optical system.

[0030] Define the center radius of curvature of the object side of the first lens L1 as R1 and the center radius of curvature of the image side of the first lens L1 as R2, satisfying the following relationship: -6.40≤(R1+R2) / (R1-R2)≤-3.27. Reasonably control the shape of the first lens L1 so that the first lens L1 can effectively correct the spherical aberration of the system.

[0031] The on-axis thickness of the first lens L1 is d1, and the total optical length of the camera lens is TTL, satisfying the following relationship: 0.039≤d1 / TTL≤0.072. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0032] The object-side surface of the second lens L2 is convex near the axis, and the image-side surface is concave near the axis. The second lens L2 has positive refractive power. The object-side and image-side surfaces of the second lens L2 can also be configured with other concave and convex distributions.

[0033] Let f be the focal length of the camera lens and f2 be the focal length of the second lens L2, satisfying the following relationship: 1.22≤f2 / f≤3.05. By controlling the positive optical power of the second lens L2 within a reasonable range, it is beneficial to correct the aberrations of the optical system.

[0034] The center radius of curvature of the object side of the second lens L2 is R3, and the center radius of curvature of the image side of the second lens L2 is R4, satisfying the following relationship: -4.11≤(R3+R4) / (R3-R4)≤-2.77, which defines the shape of the second lens L2. When within this range, as lenses develop towards ultra-thin and wide-angle lenses, it is beneficial to correct on-axis chromatic aberration.

[0035] The on-axis thickness of the second lens L2 is d3, and the total optical length of the camera lens is TTL, satisfying the following relationship: 0.085≤d3 / TTL≤0.128. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0036] The object-side surface of the third lens L3 is concave near the axis, and the image-side surface is convex near the axis. The third lens L3 has positive refractive power. The object-side and image-side surfaces of the third lens L3 can also be configured with other concave and convex distributions.

[0037] The focal length of the camera lens is defined as f, and the focal length of the third lens L3 is defined as f3, satisfying the following relationship: 1.13≤f3 / f≤2.94. Through the reasonable allocation of optical power, the system has better imaging quality and lower sensitivity.

[0038] The central radius of curvature of the object side of the third lens L3 is R5, and the central radius of curvature of the image side of the third lens L3 is R6, satisfying the following relationship: 1.27≤(R5+R6) / (R5-R6)≤8.53. This specifies the shape of the third lens L3, which is beneficial to the shaping of the third lens L3. Within the range specified by the condition, it can mitigate the degree of light deflection after passing through the lens and effectively reduce aberrations.

[0039] The on-axis thickness of the third lens L3 is d5, and the total optical length of the camera lens is TTL, satisfying the following relationship: 0.115≤d5 / TTL≤0.234. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0040] The object-side surface of the fourth lens L4 is convex near the axis, and the image-side surface is concave near the axis. The fourth lens L4 has either positive or negative refractive power. The object-side and image-side surfaces of the fourth lens L4 can also be configured with other concave or convex distributions.

[0041] The focal length of the camera lens is defined as f, and the focal length of the fourth lens L4 is f4, satisfying the following relationship: -77.72≤f4 / f≤2.85. Through the reasonable allocation of optical power, the system has better imaging quality and lower sensitivity.

[0042] The center radius of curvature of the object side of the fourth lens L4 is R7, and the center radius of curvature of the image side of the fourth lens L4 is R8, and they satisfy the following relationship: -5.17≤(R7+R8) / (R7-R8)≤11.21, which defines the shape of the fourth lens L4. When within this range, with the development of ultra-thin wide-angle lenses, it is beneficial to correct aberrations and other problems in off-axis drawing angles.

[0043] The on-axis thickness of the fourth lens L4 is d7, and the total optical length of the camera lens is TTL, satisfying the following relationship: 0.186≤d7 / TTL≤0.221. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0044] The field of view (FOV) of the camera optical lens along the diagonal direction is defined as FOV, which satisfies the following relationship: 60.00°≤FOV≤68.54°, thereby achieving wide-angle viewing.

[0045] The image height of the camera optical lens with a field of view of 1.0 is IH, and the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: 4.07≤TTL / IH≤4.77, which is conducive to achieving ultra-thinness.

[0046] The camera lens has an aperture value of FNO, satisfying the following relationship: 0.45≤FNO≤1.21, thus achieving a large aperture and good imaging performance. Preferably, it satisfies: 0.72≤FNO≤1.18.

[0047] The camera optical lens of the present invention will be described below with examples. The symbols described in each example are as follows. The units for focal length, on-axis distance, center radius of curvature, and on-axis thickness are mm.

[0048] TTL: Total optical length (axial distance from the object surface of the first lens L1 to the image plane Si), in mm; Aperture value FNO: refers to the ratio of the effective focal length to the entrance pupil diameter of a camera lens.

[0049] Image height IH of 1.0 field of view: The field of view height corresponding to the effective pixel of the sensor (i.e., half the diagonal length of the effective pixel area of ​​the sensor). 1.0 Field of View (FOV): The field of view angle corresponding to the effective pixel of the sensor; Image height Ihm of the MIC field of view: The field of view height extended beyond 1.0 to prevent assembly deviations; FOVm: The field of view angle corresponding to the image height of the MIC field of view; Preferably, the object-side and / or image-side surfaces of the lens may also be provided with inflection points and / or stagnation points to meet the requirements of high-quality imaging.

[0050] The technical solution of the present invention will be described in detail below with four embodiments. The technical effects of the present invention cannot be achieved when the above-described conditions are not met.

[0051] (First Implementation) Tables 1 and 2 show the design data of the camera optical lens 10 according to the first embodiment of the present invention.

[0052] Table 1

[0053] The meanings of each symbol are as follows.

[0054] S1: Aperture; R: Radius of curvature at the center of the optical surface; R1: The central radius of curvature of the object-side surface of the first lens L1; R2: The central radius of curvature of the image-side surface of the first lens L1; R3: The central radius of curvature of the object-side surface of the second lens L2; R4: The central radius of curvature of the image-side surface of the second lens L2; R5: The central radius of curvature of the object-side surface of the third lens L3; R6: The central radius of curvature of the image-side surface of the third lens L3; R7: The central radius of curvature of the object side surface of the fourth lens L4; R8: The central radius of curvature of the image-side surface of the fourth lens L4; R9: The center radius of curvature of the object side surface of the optical filter GF; R10: Radius of curvature of the center of the image side of the optical filter GF; d: Axial thickness of the lens, axial distance between lenses; d0: The on-axis distance from aperture S1 to the object-side surface of the first lens L1; d1: On-axis thickness of the first lens L1; d2: The on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2; d3: On-axis thickness of the second lens L2; d4: The axial distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3; d5: On-axis thickness of the third lens L3; d6: The on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4; d7: On-axis thickness of the fourth lens L4; d8: The on-axis distance from the image side of the fourth lens L4 to the object side of the optical filter GF; d9: On-axis thickness of the optical filter GF; d10: The on-axis distance from the image-side surface of the optical filter GF to the image plane Si; nd: Refractive index of the d-line (wavelength of the d-line is 587.56 nm); nd1: The refractive index of the d-line of the first lens L1; nd2: The refractive index of the d-line of the second lens L2; nd3: The refractive index of the d-line of the third lens L3; nd4: The refractive index of the d-line of the fourth lens L4; ndg: The refractive index of the d-line of the optical filter GF; vd: Abbe number; v1: Abbe number of the first lens L1; v2: Abbe number of the second lens L2; v3: Abbe number of the third lens L3; v4: Abbe number of the fourth lens L4; vg: Abbe number of the optical filter GF.

[0055] Table 2 shows the aspherical data of each lens in the camera optical lens 10 of the first embodiment of the present invention.

[0056] Table 2

[0057] For convenience, the aspherical surfaces of each lens surface are as shown in the following formula (1). However, the present invention is not limited to the aspherical polynomial form represented by formula (1).

[0058] z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )] 1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 +A12r 12 +A14r 14 +A16r 16 +A18r 18 +A20r 20 (1) Where k is the conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, and A20 are aspheric coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between a point on the aspheric curve and the optical axis, and z is the aspheric depth (the perpendicular distance between a point on the aspheric surface at a distance r from the optical axis and a tangent plane at the vertex of the aspheric optical axis).

[0059] Wherein, P1R1 and P1R2 represent the object-side and image-side of the first lens L1, respectively; P2R1 and P2R2 represent the object-side and image-side of the second lens L2, respectively; P3R1 and P3R2 represent the object-side and image-side of the third lens L3, respectively; and P4R1 and P4R2 represent the object-side and image-side of the fourth lens L4, respectively.

[0060] Figure 2 , Figure 3 A schematic diagrams of axial aberration and magnification chromatic aberration after light with wavelengths of 960nm, 940nm and 920nm passes through the camera optical lens 10 of the first embodiment are shown respectively. Figure 4 This shows a schematic diagram of field curvature and distortion after light with a wavelength of 940nm passes through the camera optical lens 10 of the first embodiment. Figure 4 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0061] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 10 is 7.272 mm, the image height IH in the 1.0 field of view is 3.868 mm, the field of view (FOV) in the 1.0 field of view is 60.00°, the image height IHm in the MIC field of view is 3.960 mm, and the field of view (FOVm) in the MIC field of view is 61.39°. The camera optical lens 10 meets the design requirements of large aperture, wide angle, and ultra-thin design, and its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0062] (Second Implementation) The symbols in the second embodiment have the same meanings as those in the first embodiment.

[0063] Unlike the first embodiment, the fourth lens L4 has negative refractive power.

[0064] Figure 5 The image shows the camera optical lens 20 according to the second embodiment of the present invention.

[0065] Tables 3 and 4 show the design data of the camera optical lens 20 according to the second embodiment of the present invention.

[0066] Table 3

[0067] Table 4 shows the aspherical data of each lens in the camera optical lens 20 of the second embodiment of the present invention.

[0068] Table 4

[0069] Figure 6 , Figure 7 A schematic diagrams of axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 960nm, 940nm and 920nm passes through the camera optical lens 20 of the second embodiment. Figure 8 This shows a schematic diagram of field curvature and distortion after light with a wavelength of 940nm passes through the camera optical lens 20 of the second embodiment. Figure 8 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0070] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 20 is 5.603 mm, the image height IH in the 1.0 field of view is 3.868 mm, the field of view (FOV) in the 1.0 field of view is 65.22°, the image height IHm in the MIC field of view is 3.960 mm, and the field of view (FOVm) in the MIC field of view is 66.58°. The camera optical lens 20 meets the design requirements of large aperture, wide angle, and ultra-thin design, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0071] (Third Implementation) The symbols in the third embodiment have the same meanings as those in the first embodiment.

[0072] Figure 9 The image shown is the camera optical lens 30 according to the third embodiment of the present invention.

[0073] Tables 5 and 6 show the design data of the camera optical lens 30 according to the third embodiment of the present invention.

[0074] Table 5

[0075] Table 6 shows the aspherical data of each lens in the camera optical lens 30 of the third embodiment of the present invention.

[0076] Table 6

[0077] Figure 10 , Figure 11 A schematic diagrams of axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 960nm, 940nm and 920nm passes through the camera optical lens 30 of the third embodiment. Figure 12This shows a schematic diagram of field curvature and distortion after light with a wavelength of 940nm passes through the camera optical lens 30 of the third embodiment. Figure 12 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0078] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 30 is 6.532 mm, the image height IH in the 1.0 field of view is 3.868 mm, the field of view (FOV) in the 1.0 field of view is 65.02°, the image height IHm in the MIC field of view is 3.960 mm, and the field of view (FOVm) in the MIC field of view is 66.32°. The camera optical lens 30 meets the design requirements of large aperture, wide angle, and ultra-thin design, and its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0079] (Fourth Implementation) The symbols in the fourth embodiment have the same meanings as those in the first embodiment.

[0080] Figure 13 The image shown is the camera optical lens 40 according to the fourth embodiment of the present invention.

[0081] Tables 7 and 8 show the design data of the camera optical lens 40 according to the fourth embodiment of the present invention.

[0082] Table 7

[0083] Table 8 shows the aspherical data of each lens in the camera optical lens 40 of the fourth embodiment of the present invention.

[0084] Table 8

[0085] Figure 14 , Figure 15 A schematic diagrams of axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 960nm, 940nm and 920nm passes through the camera optical lens 40 of the fourth embodiment. Figure 16 This shows a schematic diagram of field curvature and distortion after light with a wavelength of 940nm passes through the camera optical lens 40 of the fourth embodiment. Figure 16 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0086] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 40 is 6.830 mm, the image height IH in the 1.0 field of view is 3.868 mm, the field of view (FOV) in the 1.0 field of view is 68.54°, the image height IHm in the MIC field of view is 3.960 mm, and the field of view (FOVm) in the MIC field of view is 69.91°. The camera optical lens 40 meets the design requirements of large aperture, wide angle, and ultra-thin design, and its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0087] Table 9 shows the values ​​corresponding to various numerical values ​​and parameters specified in the conditional expressions for each of the first, second, third, and fourth implementation methods.

[0088] Table 9

[0089] Those skilled in the art will understand that the above embodiments are specific implementations of the present invention, and in practical applications, various changes can be made in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A camera optical lens, characterized in that, The camera optical lens comprises four lenses, which are arranged in the following order from the object side to the image side: a first lens with negative refractive power, a second lens with positive refractive power, a third lens with positive refractive power, and a fourth lens with either positive or negative refractive power. Wherein, the focal length of the camera optical lens is f, the entrance pupil diameter of the camera optical lens is ENPD, the focal length of the third lens is f3, the axial thickness of the third lens is d5, the central radius of curvature of the object side of the first lens is R1, the central radius of curvature of the image side of the first lens is R2, and the focal length of the first lens is f1, and the following relationship is satisfied: 0.90≤f / ENPD≤1.20; 2.00≤f3 / d5≤9.00; 0.20≤(R1+R2) / f1≤0.

70.

2. The camera optical lens according to claim 1, characterized in that, The axial distance from the image-side surface of the second lens to the object-side surface of the third lens is d4, the axial thickness of the second lens is d3, and the following relationship is satisfied: 1.30≤d4 / d3≤2.

50.

3. The camera optical lens according to claim 1, characterized in that, The central radius of curvature of the object side of the fourth lens is R7, and the central radius of curvature of the image side of the fourth lens is R8, and the following relationship is satisfied: 0.30≤R7 / R8≤1.

20.

4. The camera optical lens according to claim 1, characterized in that, The object-side surface of the first lens is concave at the paraxial position, and the image-side surface of the first lens is convex at the paraxial position. The axial thickness of the first lens is d1, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied: -4.27≤f1 / f≤-1.15; -6.40≤(R1+R2) / (R1-R2)≤-3.27; 0.039≤d1 / TTL≤0.

072.

5. The camera optical lens according to claim 1, characterized in that, The object-side surface of the second lens is convex at the paraxial position, and the image-side surface of the second lens is concave at the paraxial position. The focal length of the second lens is f2, the central radius of curvature of the object-side surface of the second lens is R3, the central radius of curvature of the image-side surface of the second lens is R4, the axial thickness of the second lens is d3, and the total optical length of the imaging optical lens is TTL, satisfying the following relationship: 1.22≤f² / f≤3.05; -4.11≤(R3+R4) / (R3-R4)≤-2.77; 0.085≤d3 / TTL≤0.

128.

6. The camera optical lens according to claim 1, characterized in that, The object-side surface of the third lens is concave near the axis, and the image-side surface of the third lens is convex near the axis. The central radius of curvature of the object-side surface of the third lens is R5, the central radius of curvature of the image-side surface of the third lens is R6, the total optical length of the camera lens is TTL, and the following relationship is satisfied: 1.13≤f3 / f≤2.94; 1.27≤(R5+R6) / (R5-R6)≤8.53; 0.115≤d5 / TTL≤0.

234.

7. The camera optical lens according to claim 1, characterized in that, The object-side surface of the fourth lens is convex at the paraxial position, and the image-side surface of the fourth lens is concave at the paraxial position. The fourth lens has a focal length of f4, a central radius of curvature of the object side of the fourth lens of R7, a central radius of curvature of the image side of the fourth lens of R8, an on-axis thickness of d7, and a total optical length of TTL, satisfying the following relationship: -77.72≤f4 / f≤2.85; -5.17≤(R7+R8) / (R7-R8)≤11.21; 0.186≤d7 / TTL≤0.

221.

8. The camera optical lens according to claim 1, characterized in that, The third and fourth lenses are made of glass.

9. The camera optical lens according to claim 1, characterized in that, The field of view (FOV) of the camera optical lens along its diagonal direction is defined as follows: 60.00°≤FOV≤68.54°.

10. The camera optical lens according to claim 1, characterized in that, The aperture value of the camera optical lens is FNO, and it satisfies the following relationship: 0.900≤FNO≤1.170.

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